This is Fortune 500 Power Moves, a column tracking executive shifts—from appointments and promotions to resignations and retirements—within the highest ranks of Fortune 500 companies.
Below is a recap of the C-suite developments at America’s highest-revenue-generating companies announced between May 9-22, 2026, organized by sector. Titles included in this roundup: CEOs (Chief Executive Officers), CFOs (Chief Financial Officers), CMOs (Chief Marketing Officers), and CHROs (Chief Human Resources Officers). We also include COOs (Chief Operating Officers), CTOs (Chief Technology Officers), CIOs (Chief Information Officers), Chief People Officers, and Chief Customer Officers when there are Power Moves within the Fortune 500 announced pertaining to those roles.
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Energy
HF Sinclair (No. 150) announced the termination of CFO Atanas Atanasov, who had been on leave since February after the company’s audit committee raised concerns. CEO Timothy Go also departed the company under a separation agreement. Franklin Myers, chair of the company’s board, will continue to serve as interim CFO; Chief Accounting Officer Vivek Garg will continue serving as acting CFO.
